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Thinking a lot about ratchets lately. Internal and external. Ratchets are more fundamental than clocks. Things that can only grow in one direction, and reversed only via destruction.
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I thought about that quite a bit actually. It's a functionalist concern: ratchets are mechanisms. If they hit diminishing returns regimes, they cease to function so you need a new one. It has to be a "clock" in some sense, an unbounded positive definite f(time) on average.
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